Price history, coupons and price alert are available on this page. Best price?
Impact Resistance 1m, Weight 4.89 (Bracket and Headband Included)oz, Charging, Beam Distance 146 yards, Built-in micro USB charging port, Beam 4500 cd, Model HC35, Maximum Brightness 2700 lumens, LED 4x XP-G3 S3 LEDs, IP Rating IP68 – 2m submersible, Battery Built-in NL2140HP 4000mAh 21700 Rechargeable Battery, Dimensions L-5.05xW-1.25xH-1.02inch
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. You can get coupon down below.
Link: Banggood product page
1. ($91.48): BGTorch4
apply it in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGHC35, BRANDNC, BGTORCH, BGdragonBoat, bGhOnEy10, bgshOOp10, BgoFErTaSchInA10, BgcLuBofErtA10, BGFLS15, BGAFF10OFF, BGCuponation10, BGHONEY2110, BG10OFFAFF, BGwhielabel, BGflashlight, BG10OFFAFF1, BANGGOODSD
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Here is price history (for all/most countries) for Nitecore HC35 XP-G3 S3 Headlamp With 21700 Battery.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).